diff options
Diffstat (limited to 'signs/common.lua')
| -rw-r--r-- | signs/common.lua | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/signs/common.lua b/signs/common.lua new file mode 100644 index 0000000..0433223 --- /dev/null +++ b/signs/common.lua @@ -0,0 +1,217 @@ +local font = {} +signs.font_height = 10 + +-- Get png width, suposing png width is less than 256 (it is the case for all font textures) +local function get_png_width(filename) + local file=assert(io.open(filename,"rb")) + -- All font png are smaller than 256x256 --> read only last byte + file:seek("set",19) + local w = file:read(1) + file:close() + return w:byte() +end + +-- Computes line width for a given font height and text +function signs.get_line_width(text) + local char + local width = 0 + + for p=1,#text + do + char = text:sub(p,p):byte() + if font[char] then + width = width + font[char].width + end + end + + return width +end + +--- Builds texture part for a text line +-- @param text Text to be rendered +-- @param x Starting x position in texture +-- @param width Width of the texture (extra text is not rendered) +-- @param y Vertical position of the line in texture +-- @return Texture string +function signs.make_line_texture(text, x, width, y) + local char + + local texture = "" + + for p=1,#text + do + char = text:sub(p,p):byte() + if font[char] then + -- Add image only if it is visible (at least partly) + if x + font[char].width >= 0 and x <= width then + texture = texture..string.format(":%d,%d=%s", x, y, font[char].filename) + end + x = x + font[char].width + end + end + return texture +end + +local function split_lines(text, maxlines) + local splits = text:split("\n") + if maxlines then + local lines = {} + for num = 1,maxlines do + lines[num] = splits[num] + end + return lines + else + return splits + end +end + +function signs.on_display_update(pos, objref) + local meta = minetest.get_meta(pos) + local text = meta:get_string("display_text") + + local ndef = minetest.registered_nodes[minetest.get_node(pos).name] + if ndef and ndef.sign_model then + local model = signs.sign_models[ndef.sign_model] + local lines = split_lines(text, model.maxlines) + + local texturew = model.width/model.xscale + local textureh = model.height/model.yscale + + local texture = "" + + local y + if model.valing == "top" then + y = signs.font_height / 2 + else + y = (textureh - signs.font_height * #lines) / 2 + 1 + end + + for _, line in pairs(lines) do + texture = texture..signs.make_line_texture(line, + (texturew - signs.get_line_width(line)) / 2, + texturew, y) + y = y + signs.font_height + end + + local texture = string.format("[combine:%dx%d", texturew, textureh)..texture + if model.color then texture = texture.."^[colorize:"..model.color end + + objref:set_properties({ textures={texture}, visual_size = {x=model.width, y=model.height}}) + end +end + +function signs.set_formspec(pos) + local meta = minetest.get_meta(pos) + local ndef = minetest.registered_nodes[minetest.get_node(pos).name] + if ndef and ndef.sign_model then + local model = signs.sign_models[ndef.sign_model] + local formspec + + if model.maxlines == 1 then + formspec = "size[6,3]".. + "field[0.5,0.7;5.5,1;display_text;Displayed text;${display_text}]".. + "button_exit[2,2;2,1;ok;Write]" + else + local extralabel = "" + if model.maxlines then + extralabel = " (first "..model.maxlines.." lines only)" + end + + formspec = "size[6,4]".. + "textarea[0.5,0.7;5.5,2;display_text;Displayed text"..extralabel..";${display_text}]".. + "button_exit[2,3;2,1;ok;Write]" + end + + meta:set_string("formspec", formspec) + end +end + +function signs.on_receive_fields(pos, formname, fields, player) + if not minetest.is_protected(pos, player:get_player_name()) then + local meta = minetest.get_meta(pos) + if fields and fields.ok then + meta:set_string("display_text", fields.display_text) + meta:set_string("infotext", "\""..fields.display_text.."\"") + display_lib.update_entities(pos) + end + end +end + +-- On place callback for direction signs +-- (chooses which sign according to look direction) +function signs.on_place_direction(itemstack, placer, pointed_thing) + local above = pointed_thing.above + local under = pointed_thing.under + local wdir = minetest.dir_to_wallmounted( + {x = under.x - above.x, + y = under.y - above.y, + z = under.z - above.z}) + + local dir = placer:get_look_dir() + + if wdir == 0 or wdir == 1 then + wdir = minetest.dir_to_wallmounted({x=dir.x, y=0, z=dir.z}) + end + + local name = itemstack:get_name() + + -- Only for direction signs (ending with _right) + if name:sub(-string.len("_right")) == "_right" then + name = name:sub(1, -string.len("_right")) + + local test = {0, dir.z, -dir.z, -dir.x, dir.x} + if test[wdir] > 0 then + itemstack:set_name(name.."left") + end + itemstack = minetest.item_place(itemstack, placer, pointed_thing, wdir) + itemstack:set_name(name.."right") + + return itemstack + else + return minetest.item_place(itemstack, placer, pointed_thing, wdir) + end +end + +-- On_rotate (screwdriver) callback for direction signs +function signs.on_rotate_direction(pos, node, user, mode, new_param2) + if mode == screwdriver.ROTATE_AXIS then + local name + if node.name:sub(-string.len("_right")) == "_right" then + name = node.name:sub(1, -string.len("_right")).."left" + end + if node.name:sub(-string.len("_left")) == "_left" then + name = node.name:sub(1, -string.len("_left")).."right" + end + + if name then + minetest.swap_node(pos, {name = name, param1 = node.param1, param2 = node.param2}) + end + return false + else + return display_lib.on_rotate(pos, node, user, mode, new_param2) + end +end + +-- Populate fonts table +local w, filename +for charnum=32,126 do + filename = string.format("signs_%02x.png", charnum) + w = get_png_width(signs.path.."/textures/"..filename) + font[charnum] = {filename=filename, width=w} +end + +-- Generic callback for show_formspec displayed formspecs +minetest.register_on_player_receive_fields(function(player, formname, fields) + local found, mod, node_name, pos + found, _, mod, node_name, pos = formname:find("([%w_]+):([%w_]+)@(.+)") + + if found then + if mod ~= 'signs' then return end + + local ndef = minetest.registered_nodes[mod..":"..node_name] + + if ndef and ndef.on_receive_fields then + ndef.on_receive_fields(minetest.string_to_pos(pos), formname, fields, player) + end + end +end) |